Helmet-dust plug



FIG. 1 is a perspective view of the helmet-dust plug;

FIG. 2 is a top view of the helmet-dust plug of FIG. 1;

FIG. 3 is a right side view of the helmet-dust plug of FIG. 1, the left side opposite being a mirror image;

FIG. 4 is a front view of the helmet-dust plug of FIG. 1;

FIG. 5 is a bottom view of the helmet-dust plug of FIG. 1;

FIG. 6 is a back view of the helmet-dust plug of FIG. 1; and,

FIG. 7 is a perspective view of the helmet-dust plug used in connection with a cell phone.

The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a helmet-dust plug, as shown and described. 